This page explains how Jianfeng Qiu (USATT# 215262)'s rating went from 1538 to 1515 at the Swan Sunday League event from 17 Mar 2024. The links below take you to pages that describe various aspects of the rating processor.

The rating processor goes through 4 passes in order. The links take you to pages that provide detailed explanations of the calculations during each of the 4 passes.